Answer:  The
USGS supports an important National
Earthquake Program. As a small part of that effort there have been
studies attempting to correlate magnetic variations, or more precisely,
electro-magnetic variations, with earthquakes. It is worth acknowledging
that geophysicists would actually dearly love to demonstrate a causal
relationship between electro-magnetic variations and earthquakes, especially
if they could be used for predicting earthquakes! Unfortunately, no convincing
evidence of a correlation has been found, despite decades of work. And
it should be emphasized that isolated coincidences are not sufficient
to demonstrate a relationship. What is needed to confirm an extraordinary
claim is, of course, an extraordinary amount of evidence, which in this
case would mean many repeated correlations of earthquakes with specific
and identifiable field variations. Such evidence simply doesn’t
exist in this case.
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